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Securities Excluded from Calculation of Diluted Net (Loss) Income Per Share (Detail)
12 Months Ended
Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Weighted average number of securities excluded from computation 111,062us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Stock options  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Weighted average number of securities excluded from computation 92,100us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Restricted stock units  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Weighted average number of securities excluded from computation 18,962us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember